Alvarez et al. (1980)
Also: Alvarez et al. 1980
Extraterrestrial cause for the Cretaceous-Tertiary extinction
Alvarez, L. W., Alvarez, W., Asaro, F., & Michel, H. V. (1980). Extraterrestrial cause for the Cretaceous-Tertiary extinction. Science, 208(4448), 1095-1108. Link to PDF
DOI: 10.1126/science.208.4448.1095
References
All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.